Strøm Sensor Lav Ohm

Strøm Sensor Lav Ohm

Current sensing resistors are resistors used for measuring current in the circuit which can be converted using Ohm’s Law into a voltage reading. They usually come in very low resistance values, often measured in micro Ohms. At Rhopoint Nordic we offer a wide range of current sensing resistors by leading manufacturers including Isabellenhütte, Alpha and Riedon. Our current sensing resistors come in various shapes and sizes, surface-mount and through-hole, and we can cater for virtually any resistance value.

Can't find what you're looking for? Contact us, we can often offer customised solution to meet all your needs.

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Alpha FNP Series

The FNP high power precision shunt resistor series from Alpha Electronics offers a range of very high precision current sensing shunts with a maximum power rating of 500W on a suitable heat sink at +25°C. By utilising a Ni-Cr Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients. The FNP shunt resistor series has a built in Pt100 sensor for monitoring the temperature of the resistive element.

  • High power precision shunt resistor
  • Available in any resistance between 0.001Ω and 1Ω (higher values may be available upon request)
  • Tight tolerance options as low as ±0.05% available
  • Tight TCR options available of ±1 ppm/°C and ±2.5 ppm/°C (+25°C to +60°C) or ±5 ppm/°C (-25°C to +125°C)
  • Maximum rated power of 500W
  • Maximum working current of 320A
  • Maximum rated operating temperature +75°C (resistance values greater than 0.01Ω, +25°C for resistances of 0.01Ω or below)
  • Working temperature from -55°C up to +125°C
  • Single pulse power load of 50J (<10ms)

The Alpha Electronics FNP precision shunt resistor series are constructed out of the following materials:

  • Base plate - Nickel-plated Copper
  • Current terminals - Nickel-plated Copper (T = 1.0mm)
  • Voltage and Pt terminals - Nickel-plated Copper (T = 0.5mm)
  • Package - PPS injection-moulded case

Alpha's Ni-Cr Bulk Metal® foil resistor technology means these high power precision shunt resistors resistors are ideal in applications like:

  • Output reference of precision power supply
  • Reference of charge-discharge test for high capacity batteries

The below table gives a summary of the specifications and options available for the Alpha FNP series:

Alpha FNP Specifications

* Keep temperature of the resistive element surface less than +125°C
** Please contact us for higher resistance values

£0.00 Ex Tax: £0.00

Alpha PSB Series

The PSB ultra-precision power shunt resistor series from Alpha Electronics offers 4-terminal (Kelvin) connections for current sensing and a power rating of up to 40W on a heat sink or 12W in free air (at +25°C) all with a low ohmic resistance range from 0.001Ω to 1Ω. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer excellent temperature characteristics with low temperature coefficients down to ±5 ppm/°C between the resistance range 0.005Ω and 1Ω.

  • Ultra-precision power shunt resistor
  • Available in any resistance between 0.001Ω and 1Ω
  • 4-terminal (Kelvin) connection high power shunt
  • High heat dissipation due to aluminium-clad construction with fins
  • Power rating of 40W on a heat sink or 12W in free air at +25°C
  • Tolerances as low as ±0.1% over the whole resistance range
  • Tight TCR available of ±5 ppm/°C between 0.005Ω and 1Ω
  • Maximum working current of 100A
  • Maximum rated operating temperature +25°C
  • Working temperature from -55°C up to +85°C

The PSB ultra-precision shunt resistor series exhibits excellent temperature characteristics thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision and high power applications.

The 4-terminal connections of this high power shunt series offers accurate current sensing capabilities even in low extremity of resistance.

The PSB series has been designed for easy mounting to heat sink or water-cooled radiator as well as with threaded holes to fix cables with screws (Caution: please screw current terminals >5N·m and voltage terminals >1N·m)

Their 4-terminal design and high precision make them ideal for current sensing in precise power supply or motor driver applications.

The below table gives a summary of the specifications and options available for the Alpha PSB series:

Alpha PSB Specifications

* Thermal resistance of the heat sink 1°C/W
Available to use higher rated power with elevation of cooling effect
Please keep temperature of element surface less than +60°C

£0.00 Ex Tax: £0.00

Alpha RBD Series

The RBD ultra-precision current sense resistor series from Alpha Electronics offers low resistances of between 0.01Ω and 1Ω all in a small 2-terminal flip-chip package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.5% as well as a low TCR of ±10 ppm/°C (between -25°C and +125°C) both within the resistance range of 0.1Ω to 1Ω.

  • Ultra-precision current sense flip-chip resistor
  • Available in any resistance between 0.01Ω and 1Ω
  • 2-terminal current sense resistor in a flip-chip surface-mount package
  • Power rating of 0.5W at +70°C
  • Tolerances as low as ±0.5% over the resistance range of 0.1Ω to 1Ω
  • Tight TCR available of ±10 ppm/°C over the resistance range of 0.1Ω to 1Ω
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RBD ultra-precision current sense resistor series offer ultra-precision thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

Temperature rise of resistor surface can be optimised by using a board made of metal. This keeps the temperature rise very low allowing increased power rating of the parts i.e. 2W at +70°C. Please keep the temperature of board less than +90°C when using glazed epoxy board.

The below table gives the full specifications for each resistor model available including the Alpha RBD series:

Alpha RBD Specifications

* Symbols parenthesized are for part number composition

£0.00 Ex Tax: £0.00

Alpha RBF Series

The RBF ultra-precision current sense resistor series from Alpha Electronics offers low resistances of between 0.01Ω and 1Ω all in a small 2-terminal flip-chip package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.5% as well as a low TCR of ±10 ppm/°C (between -25°C and +125°C) both within the resistance range of 0.1Ω to 1Ω.

  • Ultra-precision current sense flip-chip resistor
  • Available in any resistance between 0.01Ω and 1Ω
  • 2-terminal current sense resistor in a flip-chip surface-mount package
  • Power rating of 1W at +70°C
  • Tolerances as low as ±0.5% over the resistance range of 0.1Ω to 1Ω
  • Tight TCR available of ±10 ppm/°C over the resistance range of 0.1Ω to 1Ω
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RBF ultra-precision current sense resistor series offer ultra-precision thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

Temperature rise of resistor surface can be optimised by using a board made of metal. This keeps the temperature rise very low allowing increased power rating of the parts i.e. 2W at +70°C. Please keep the temperature of board less than +90°C when using glazed epoxy board.

The below table gives the full specifications for each resistor model available including the Alpha RBF series:

Alpha RBF Specifications

* Symbols parenthesized are for part number composition

£0.00 Ex Tax: £0.00

Alpha RBH Series

The RBH ultra-precision current sense resistor series from Alpha Electronics offers low resistances of between 0.01Ω and 1Ω all in a small 4-terminal (Kelvin connection) flip-chip package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.5% as well as a low TCR of ±10 ppm/°C between -25°C and +125°C.

  • Ultra-precision current sense flip-chip resistor
  • Available in any resistance between 0.01Ω and 1Ω
  • 4-terminal (Kelvin connection) current sense resistor in a flip-chip surface-mount package
  • Power rating of 1.5W at +70°C
  • Tolerances as low as ±0.5% over the whole resistance range of 0.01Ω to 1Ω
  • Tight TCR available of ±10 ppm/°C over the resistance range of 0.01Ω to 1Ω
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RBH ultra-precision current sense resistor series offer ultra-precision thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

Temperature rise of resistor surface can be optimised by using a board made of metal. This keeps the temperature rise very low allowing increased power rating of the parts i.e. 2W at +70°C. Please keep the temperature of board less than +90°C when using glazed epoxy board.

The below table gives the full specifications for each resistor model available including the Alpha RBH series:

Alpha RBH Specifications

* Symbols parenthesized are for part number composition

£0.00 Ex Tax: £0.00

Alpha RWA Series

The RWA precision wraparound SMD resistor series from Alpha Electronics offers resistances from 100Ω up to 5kΩ, all with a small 0603 chip size. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.05% (between 1kΩ and 5kΩ) as well as a low TCR of ±5 ppm/°C (between -25°C and +125°C) over the whole resistance range. The Alpha RWA series also offers excellent load-life stability of ±0.005% typical (+70°C, 2000 hours at rated power).

  • High precision wraparound SMD resistor
  • Available in any resistance between 100Ω and 5kΩ
  • 2-terminal resistor in a 0603 surface-mount package
  • Power rating of 0.1W at +70°C
  • Tolerances as low as ±0.05% over the resistance range of 1kΩ to 5kΩ
  • Tight TCR available of ±5 ppm/°C over the resistance range of 100Ω to 5kΩ
  • Maximum working voltage of 22V
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RWA high precision wraparound surface-mount resistor series offers high precision and excellent stability thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

The below table gives the full specifications for each resistor model available including the Alpha RWA series:

Alpha RWA Specifications

£0.00 Ex Tax: £0.00

Alpha RWB Series

The RWB precision wraparound SMD resistor series from Alpha Electronics offers resistances from 10Ω up to 10kΩ, all with a small 0805 chip size. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.02% (between 1kΩ and 10kΩ) as well as a low TCR of ±2 ppm/°C (between -25°C and +125°C) from 100Ω up to 10kΩ. The Alpha RWB series also offers excellent load-life stability of ±0.005% typical (+70°C, 2000 hours at rated power).

  • High precision wraparound SMD resistor
  • Available in any resistance between 10Ω and 10kΩ
  • 2-terminal resistor in a 0805 surface-mount package
  • Power rating of 0.2W at +70°C
  • Tolerances as low as ±0.02% over the resistance range of 1kΩ to 10kΩ
  • Tight TCR available as low as ±2 ppm/°C over the resistance range of 100Ω to 10kΩ
  • Maximum working voltage of 45V
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RWB high precision wraparound surface-mount resistor series offers high precision and excellent stability thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

The below table gives the full specifications for each resistor model available including the Alpha RWB series:

Alpha RWB Specifications

£0.00 Ex Tax: £0.00

Alpha RWC Series

The RWC precision wraparound SMD resistor series from Alpha Electronics offers resistances from 5Ω up to 30kΩ, all with a small 1206 chip size. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.01% (between 1kΩ and 30kΩ) as well as a low TCR of ±2 ppm/°C (between -25°C and +125°C) from 100Ω up to 30kΩ. The Alpha RWC series also offers excellent load-life stability of ±0.005% typical (+70°C, 2000 hours at rated power).

  • High precision wraparound SMD resistor
  • Available in any resistance between 5Ω and 30kΩ
  • 2-terminal resistor in a 1206 surface-mount package
  • Power rating of 0.3W at +70°C
  • Tolerances as low as ±0.01% over the resistance range of 1kΩ to 30kΩ
  • Tight TCR available as low as ±2 ppm/°C over the resistance range of 100Ω to 30kΩ
  • Maximum working voltage of 95V
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RWC high precision wraparound surface-mount resistor series offers high precision and excellent stability thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

The below table gives the full specifications for each resistor model available including the Alpha RWC series:

Alpha RWC Specifications

£0.00 Ex Tax: £0.00

Isabellenhütte A-H1 Series

The A-H1 through-hole resistor series from Isabellenhütte offers 4-terminal connection technology for current sensing applications. Designed for easy heat sink mounting, the Kelvin connections on this resistor allow high precision measurements even with a low resistance values range from 0.001Ω to 100Ω available. The A-H1 series from Isabellenhütte has low inductance and has high pulse power handling capabilities.

  • 4-terminal through-hole resistor
  • Designed for easy heat sink mounting
  • Select values between the resistance range from 0.001Ω to 100Ω available
  • Power rating 10W on a suitable heat sink (3W power rating in free air)
  • Maximum permanent current of 81A (constant)
  • Applicable temperature range from -55°C to +140°C
  • Tolerance options available of ±0.1% and ±1% (depending on the resistance values required)
  • TCR of <30 ppm/K (between +20°C and +60°C)
  • Low self-heating

Typical applications for the A-H1 series include:

  • Measurement equipment
  • Reference resistors in laboratories
  • Current sources
  • Laboratory power supplies

The below table gives an overview of the specifications for the Isabellenhütte A-H1 series:

Isabellenhütte A-H1 Specifications

* Please contact us for available parts or see the ordering information tab

£0.00 Ex Tax: £0.00

Isabellenhütte A-H2 Series

The A-H2 through-hole resistor series from Isabellenhütte offers 4-terminal connection technology for current sensing applications. Designed for easy heat sink mounting, the Kelvin connections on this resistor allow high precision measurements even with a low resistance values range from 0.001Ω to 100Ω available. The A-H2 series from Isabellenhütte has low inductance and has high pulse power handling capabilities.

  • 4-terminal through-hole resistor
  • Designed for easy heat sink mounting
  • Select resistance ranges between 0.001Ω and 100Ω available
  • Power rating 10W on a suitable heat sink (3W power rating in free air)
  • Maximum permanent current of 81A (constant)
  • Applicable temperature range from -55°C to +140°C
  • Tolerance options available of ±0.1% and ±1% (depending on the resistance values required)
  • TCR of <30 ppm/K (between +20°C and +60°C)
  • Low self-heating

Typical applications for the A-H2 series include:

  • Measurement equipment
  • Reference resistors in laboratories
  • Current sources
  • Laboratory power supplies

The below table gives an overview of the specifications for the Isabellenhütte A-H2 series:

Isabellenhütte A-H2 Specifications

* Please contact us for available parts or see the ordering information tab

£0.00 Ex Tax: £0.00

Isabellenhütte AZ-H1 Series

The AZ-H1 through-hole resistor series from Isabellenhütte offers 4-terminal connection technology for current sensing applications with very low TCR. Designed for easy heat sink mounting, the Kelvin connections on this resistor allow high precision measurements even with a low resistance range of 0.002Ω to 1Ω. The AZ-H1 series from Isabellenhütte has low inductance and has high pulse power handling capabilities.

  • 4-terminal through-hole resistor
  • Designed for easy heat sink mounting
  • Select resistance range between 0.002Ω and 1Ω available
  • Power rating 10W on a suitable heat sink (3W power rating in free air)
  • Maximum permanent current of 70A (0.002Ω)
  • Applicable temperature range from -55°C to +140°C
  • Tolerance options available ±0.1% and ±1% (depending on the resistance values required)
  • TCR of <3 ppm/K (between +20°C and +60°C) and TCR of 10 ppm/K (between +20°C and +60°C)
  • Low self-heating

Typical applications for the AZ-H1 series include:

  • Measurement equipment
  • Reference resistors in laboratories
  • Current sources
  • Laboratory power supplies

The below table gives an overview of the specifications for the Isabellenhütte AZ-H1 series:

Isabellenhütte AZ-H1 Specifications

* Please contact us for available parts or see the ordering information tab

£0.00 Ex Tax: £0.00

Isabellenhütte AZ-H2 Series

The AZ-H2 through-hole resistor series from Isabellenhütte offers 4-terminal connection technology for current sensing applications with very low TCR. Designed for easy heat sink mounting, the Kelvin connections on this resistor allow high precision measurements even with a low resistance range of 0.002Ω to 1Ω. The AZ-H2 series from Isabellenhütte has low inductance and has high pulse power handling capabilities.

  • 4-terminal through-hole resistor
  • Designed for easy heat sink mounting
  • Select resistance range 0.002Ω to 1Ω available
  • Power rating 10W on a suitable heat sink (3W power rating in free air)
  • Maximum permanent current of 70A (0.002Ω)
  • Applicable temperature range from -55°C to +140°C
  • Tolerance options available ±0.1% and ±1% (depending on the resistance values required)
  • TCR of <3 ppm/K (between +20°C and +60°C) and TCR of 10 ppm/K (between +20°C and +60°C)
  • Low self-heating

Typical applications for the AZ-H2 series include:

  • Measurement equipment
  • Reference resistors in laboratories
  • Current sources
  • Laboratory power supplies

The below table gives an overview of the specifications for the Isabellenhütte AZ-H2 series:

Isabellenhütte AZ-H2 Specifications

* Please contact us for available parts or see the ordering information tab

£0.00 Ex Tax: £0.00

Isabellenhütte BAC Series

The BAC precision resistor series from Isabellenhütte includes a PCB with connector for voltage sensing, designed for battery management systems or welding equipment with a low resistance value of 50µΩ or 100µΩ. The BAC series from Isabellenhütte is available with untinned or Ni-plated terminals, continuous load up to 550A (50µΩ) within a chip size of 8420.

  • 2-terminal shunt resistor
  • Maximum fastening torque of 10Nm
  • Shunt available with untinned or Ni-plated terminals
  • Permanent power up to 15W
  • Resistance values of 50µΩ or 100µΩ
  • TCR of <150 ppm/K (between +20°C and +60°C)
  • Applicable temperature range from -10°C to +125°C
  • Tolerance of ±5.0%
  • 8420 Chip size

Typical applications for the BAC series include:

  • Current sensor for electronic battery management in motor cars, trucks, forklifts, hybrid and electric vehicles
  • Current sensing in bus bars
  • Current sensing in welding equipment

The below table gives an overview of the specifications for the Isabellenhütte BAC series:

Isabellenhütte BAC Specifications

£0.00 Ex Tax: £0.00

Isabellenhütte BAS Series

The BAS precision resistor series from Isabellenhütte, designed for battery management systems or welding equipment with a low resistance values from 0.000035Ω to 0.0005Ω. The BAS series from Isabellenhütte is available with tinned or untinned terminals, continuous load up to 350A (100µΩ) within a chip size of 8420.

  • 2-terminal shunt resistor
  • Maximum fastening torque 10Nm
  • Shunt available with tinned or untinned terminals
  • Permanent power up to 30W
  • Resistance values range from 35µΩ to 500µΩ
  • TCR value <50 ppm/K (from +20°C to +60°C)
  • Applicable temperature range from -40°C to +170°C
  • ±5.0% tolerance
  • AEC-Q200 qualified (automotive version A)
  • 8420 Chip size
  • Further versions with various dimensions upon request

Typical applications for the BAS series include:

  • Current sensor for electronic battery management in motor cars, trucks, forklifts, hybrid and electric vehicles
  • Current sensing in bus bars
  • Current sensing in welding equipments

The below table gives an overview of the specifications for the Isabellenhütte BAS series:

Isabellenhütte BAS Specifications

£0.00 Ex Tax: £0.00

Isabellenhütte BKW Series

The BKW 4-terminal precision resistor series from Isabellenhütte, designed for energy meters with resistance values from 0.0003Ω to 0.0005Ω. The BKW series from Isabellenhütte has extremely good long-term stability, thus the energy meters do not require any recalibration, very high reproducibility of R-value and TCR.

  • 4-terminal precision resistor, independent from temperature because of lowest TCR-values
  • Massive copper terminals
  • Mounting: screwed on terminals of kWh-meter
  • Permanent current upto 100A (0.0003Ω)
  • Resistance values 0.0003Ω, 0.0004Ω and 0.0005Ω
  • TCR value <20 ppm/K (from +20°C to +60°C)
  • Applicable temperature range from -55°C to +140°C
  • Tolerance ±5.0%
  • Qualified for 20A, 40A, 60A and 80A energy meters

Typical applications for the BKW series include:

  • Ideal for single and three phase energy meters
  • Battery current sensing

The below table gives an overview of the specifications for the Isabellenhütte BKW series:

Isabellenhütte BKW Specifications

£0.00 Ex Tax: £0.00